I forgot to mention there is a workaround (though it isn't elegant). If you have a paid account you can duplicate the form file, and then delete the responses from the dup form file that you do not want in the summary report. The summary report will only show the responses that are actually in the table - you can then save it to PDF or images for distribution.

Its kinda a hack but it works. Thought this might help in the short term.

In the latest release, the filtering UI will now be available in both the View Responses and Summary Report tabs. When a filter is set it will change the results shown in both tabs. This should provide a lot more flexibility when generating Summary Reports.